Fix no such module 'DOT'

[yanamura]

Problem

create cli folder and put this Package.swift

// swift-tools-version:5.1
import PackageDescription

let package = Package(
    name: "Tools",
    dependencies: [
        .package(url: "https://github.com/yonaskolb/XcodeGen", .branch("master"))
    ]
)

and run
swift run --package-path cli xcodegen

cause this error

XcodeGen/Sources/XcodeGenKit/GraphVizGenerator.swift:1:8: error: no such module 'DOT'
import DOT`

Solution

Update GraphViz 0.2.0 to 0.4.0
diff

With this update, we no longer to import Dot.

Changed package to produce a single library named `GraphViz` so that
  `Dot`, `Tools`, and `GraphVizBuilder` need not be imported separately anymore.

[freddi-kit]

Hi, @yanamura, thank you for your contribution! Could you update CHANGELOG.md about your fixing?

Example: https://github.com/yonaskolb/XcodeGen/pull/1064/files#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4ed

please make Fixed column in Next Version.

[yonaskolb]

Thank you @yanamura!

[yonaskolb]

It looks like CI didn't run for this PR for some reason. But now we have errors

ld: warning: Could not find or use auto-linked library 'cgraph'
ld: warning: Could not find or use auto-linked library 'gvc'
Undefined symbols for architecture x86_64:
  "_agerrors", referenced from:
      _$s8GraphViz7attempt8throwingxxyXE_tKlF in Error.swift.o
  "_aglasterr", referenced from:
      _$s8GraphViz5ErrorV04lastC7Message026_24C6592C881063ABBFDC7A6D4J5AA881LLSSSgvgZ in Error.swift.o
  "_agmemread", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_SpySo8Agraph_sVGSgSPys4Int8VGKXEfU_AWyXEfU_ in Renderer.swift.o
  "_gvContext", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_ in Renderer.swift.o
  "_gvFreeContext", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_6$deferL_yyF in Renderer.swift.o
  "_gvFreeLayout", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_6$deferL0_yyF in Renderer.swift.o
  "_gvFreeRenderData", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_6$deferL1_yyF in Renderer.swift.o
  "_gvLayout", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_ySPys4Int8VGKXEfU1_s5Int32VyXEfU_ in Renderer.swift.o
  "_gvRenderData", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_ySPys4Int8VGKXEfU2_s5Int32VyXEfU_ in Renderer.swift.o
  "_gvToolTred", referenced from:
      _$s8GraphViz8RendererC6render3dot2to2on10completionySS_AA6FormatOSo17OS_dispatch_queueCys6ResultOy10Foundation4DataVs5Error_pGctFyycfU_AQyKXEfU_s5Int32VyXEfU0_ in Renderer.swift.o
ld: symbol(s) not found for architecture x86_64
<unknown>:0: error: link command failed with exit code 1 (use -v to see invocation)